1. General Results, most used to calculate the result A name "websteady.pl" is domain, public suffix is "pl", top-level-domain-type is "country-code", Country is Poland, tld-manager is "Research and Academic Computer Network" A Good: All ip addresses are public addresses A Good: destination is https A Good - only one version with Http-Status 200 A Good: one preferred version: non-www is preferred A Good: All urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset) A http://websteady.pl/ 91.211.222.86 https://websteady.pl/ Correct redirect http - https with the same domain name B https://websteady.pl/ 91.211.222.86 Missing HSTS-Header B https://www.websteady.pl/ 91.211.222.86 Missing HSTS-Header D http://www.websteady.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 91.211.222.86 http://websteady.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Wrong redirect one domain http to other domain http. First redirect to https without changing the domain, so no new dns query is required. So the server can send the HSTS header. That's fundamental using HSTS (Http Strict Transport Security). First step: Add correct redirects http ⇒ https. Perhaps in your port 80 vHost something like "RewriteEngine on" + "RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,QSA,R=permanent]" (two rows, without the "). Don't add this in your port 443 vHost, that would create a loop. Then recheck your domain, should be Grade C. There is the rule to select one https version as preferred version. E http://www.websteady.pl/ 91.211.222.86 https://websteady.pl/ Wrong redirect one domain http to other domain https. First redirect to https without new dns query, so the server can send the HSTS header. That's fundamental using HSTS (Http Strict Transport Security). First step: Add correct redirects http ⇒ https. Perhaps in your port 80 vHost something like "RewriteEngine on" + "RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,QSA,R=permanent]" (two rows, without the "). Don't add this in your port 443 vHost, that would create a loop. Then recheck your domain, should be Grade C. There is the rule to select one https version as preferred version. N https://websteady.pl/ 91.211.222.86 Error - Certificate isn't trusted, RemoteCertificateNameMismatch N https://www.websteady.pl/ 91.211.222.86 https://websteady.pl/ Error - Certificate isn't trusted, RemoteCertificateNameMismatch 2. Header-Checks (alpha, started 2022-10-23, may be buggy / incomplete) 3. DNS- and NameServer - Checks A Good: Nameserver supports TCP connections: 9 good Nameserver X Nameserver Timeout checking Echo Capitalization: h-dns.pl X Nameserver Timeout checking EDNS512: h-dns.pl Nameserver doesn't pass all EDNS-Checks: h-dns.pl: OP100: fatal timeout. FLAGS: fatal timeout. V1: fatal timeout. V1OP100: fatal timeout. V1FLAGS: fatal timeout. DNSSEC: fatal timeout. V1DNSSEC: fatal timeout. NSID: fatal timeout. COOKIE: fatal timeout. CLIENTSUBNET: fatal timeout. A Good: All SOA have the same Serial Number Warning: No CAA entry with issue/issuewild found, every CAA can create a certificate. Read https://en.wikipedia.org/wiki/DNS_Certification_Authority_Authorization to learn some basics about the idea of CAA. Your name server must support such an entry. Not all dns providers support CAA entries. 4. Content- and Performance-critical Checks A Good: All checks /.well-known/acme-challenge/random-filename without redirects answer with the expected http status 404 - Not Found. Creating a Letsencrypt certificate via http-01 challenge should work. If it doesn't work: Check your vHost configuration (apachectl -S, httpd -S, nginx -T). Every combination of port and ServerName / ServerAlias (Apache) or Server (Nginx) must be unique. Merge duplicated entries in one vHost. If you use an IIS, extensionless files must be allowed in the /.well-known/acme-challenge subdirectory. Create a web.config in that directory. Content: <configuration><system.webServer><staticContent><mimeMap fileExtension="." mimeType="text/plain" /></staticContent></system.webServer></configuration>. If you have a redirect http ⇒ https, that's ok, Letsencrypt follows such redirects to port 80 / 443 (same or other server). There must be a certificate. But the certificate may be expired, self signed or with a not matching domain name. Checking the validation file Letsencrypt ignores such certificate errors. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. A Good: Domainname is not on the "Specially Designated Nationals And Blocked Persons List" (SDN). That's an US-list of individuals and companies owned or controlled by, or acting for or on behalf of, targeted countries. It also lists individuals, groups, and entities, such as terrorists and narcotics traffickers designated under programs that are not country-specific. Collectively, such individuals and companies are called "Specially Designated Nationals" or "SDNs." Their assets are blocked and U.S. persons are generally prohibited from dealing with them. So if a domain name is on that list, it's impossible to create a Letsencrypt certificate with that domain name. Check the list manual - https://www.treasury.gov/resource-center/sanctions/sdn-list/pages/default.aspx A Duration: 134147 milliseconds, 134.147 seconds